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1
Content available remote

Ultrasonic Absorption Coefficient and Propagation Velocity in Critical Benzonitrile-Isooctane Mixture

100%
Hornowski T.
Acta Physica Polonica A
|
1992
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vol. 82
|
issue 6
961-966
EN
Measurements of the absorption coefficient and propagation velocity of ultrasonic waves in critical benzonitrile and isooctane mixture are reported for the frequency range of 5-25 MHz and temperatures ΔT = T - T_{c} from 0.15 to 20 K. The analysis of the experimental results is based on dynamic scaling theory leading to good agreement with the theoretical predictions, especially in the reduced frequency range 1 < ω* < 100. The adiabatic coupling constant g is calculated and compared to the experimental value.
2
Content available remote

Absorption and Dispersion of Ultrasonic Waves in n-Amylic Alcohol-Nitromethane Critical Mixture

63%
Hornowski T., Łabowski M.
Acta Physica Polonica A
|
1991
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vol. 79
|
issue 5
671-682
EN
Measurement of absorption and propagation velocity of ultrasonic waves as well as shear viscosity in n-amylic alcohol-nitromethane critical mixture are reported. Acoustic measurements were performed in the frequency range from 5 to 25 MHz and temperatures ΔT = T - T_{c} from 0.1 to 12.3 K. An analysis of the results was carried out on the basis of a modified version of mode-coupling theory [10], which led to good agreement with experiment. The correlation length ξ_{0} = 0.94 Ǻ is in agreement with the value obtained from optical measurements.
3
Content available remote

The SAXS and Rheological Studies of HEWL Amyloid Formation

51%
Szymańska A., Ślósarek G., Hornowski T., Kozak M.
Acta Physica Polonica A
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2008
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vol. 114
|
issue 2
447-454
EN
We performed small angle X-ray scattering and rheological experiments in order to analyze the aggregation and denaturation processes of hen egg white lysozyme initiated by the presence of ethanol molecule. At low ethanol concentrations (below 60% (v/v)) we did not observe any change of the radius of gyration of lysozyme and no drastic changes in viscosity of the protein solution. With the increase in ethanol concentration up to the final concentration of 85% (v/v) the viscosity of protein solution dramatically increased. For high ethanol concentration a pseudoplastic behavior of lysozyme solution was observed, indicating a process of aggregation and reorientation of the protein molecules. Similar effects were observed in small angle X-ray scattering experiments. We assume that the analysis of the aggregation processes of the hen egg white lysozyme could contribute to our understanding of the mechanism of lysozyme amyloid formation.
4
Content available remote

Ultrasonic Waves in Magnetic Liquids: Two-Phase Approach and Experimental Results

51%
Kaczmarek M., Hornowski T., Skumiel A., Łabowski M.
Acta Physica Polonica A
|
2000
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vol. 97
|
issue 4
639-649
EN
A two-phase model of dynamical behavior of magnetic liquid influenced by constant magnetic field is considered. The model takes into account mutual interaction of clusters giving skeleton's stiffness and interaction of clusters with free liquid producing attenuation and dispersion of waves for transversally isotropic system. Rotational degrees of freedom are disregarded. Predictions of the model are discussed for variable amount of clusters and compared with experimental data for different magnetic fields.
5
Content available remote

Ultrasonic Wave Propagation Velocity in Nonconducting Liquids in an External DC Electric Field

51%
Łabowski M., Skumiel A., Hornowski T.
Acta Physica Polonica A
|
1991
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vol. 79
|
issue 5
683-693
EN
A theoretical analysis of variations in the propagation velocity of ultrasonic waves in liquid dielectrics in an external DC electric field was performed. Measurements of these variations in transformer oil in dependence on the field strength and temperature were made applying the phase method. To express the experimental results in graphical form numerical procedure of interpolation in Lagrange polynomials was used. The experimentally obtained variations in the velocity are compared with those predicted theoretically by the formulae derived.
6
Content available remote

Dependence of Ultrasonic and Magnetic Hyperthermia on the Concentration of Magnetic Nanoparticles

39%
Kaczmarek K., Hornowski T., Bielas R., Żak D., Timko M., Józefczak A.
Acta Physica Polonica A
|
2018
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vol. 133
|
issue 3
716-718
EN
Hyperthermia treatment is the heating of tumor tissue up to temperatures between 41°C and 45°C, which trigger several physiological reactions in the body. Hyperthermia within tissue can be applied through various mechanisms. One of them is magnetic hyperthermia which uses superparamagnetic iron oxide nanoparticles (SPIONs) heated by an externally applied magnetic field. SPIONs can also be used as sonosensitizers in ultrasound hyperthermia increasing acoustic wave attenuation. The impact of SPION concentration on thermal effect during ultrasonic and magnetic hyperthermia was investigated in agar-gel phantom with added magnetite nanoparticles. The presence of nanoparticles in the tissue-mimicking phantom increases the thermal losses of ultrasound energy and temperature of the phantom.
7
Content available remote

Properties of Magnetosome Suspension under the Influence of Magnetic Field

33%
Józefczak A., Molčan M., Rozynek Z., Hornowski T., Skumiel A., Timko M., Tóthová J., Kopčanský P., Leszczyński B.
Acta Physica Polonica A
|
2015
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vol. 127
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issue 2
629-631
EN
The magnetotactic bacteria synthesize chains of nanosized magnetic particles that function as a compass needle to navigate in the direction of the earth's magnetic field. Magnetosomes are bacterial magnetic nanoparticles containing iron mineral crystals of magnetite or greigite, enveloped by a natural biological membrane. The objective of the work is to study the influence of magnetic field on rheology and acoustic properties of magnetosome suspension. Experimental results show a clear effect of the external magnetic field on the acoustic parameters such as velocity and attenuation of ultrasonic wave, and the viscosity of the suspension, arising from the biogenic magnetic particles aggregation.
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